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Eva was in the operating room for 17 hours, while Erika was in surgery for 18 hours. The girls are being monitored in the hospital's pediatric Intensive Care Unit, where they are recovering in adjacent beds, a hospital spokesperson said.

KCRA

"The twins did very well," lead surgeon Dr. Gary Hartman said. "I'm very pleased; this is as good as we could have asked for."

Hartan led a team of about 50 physicians, nurses and operating room staff during the procedure.

The twins shared a pelvis, a leg and a fused liver, according to their mother, Aida Sandoval.

Aida Sandoval learned during pregnancy that her girls were conjoined and spoke to KCRA 3 days before her daughters' surgery. She said that although she was worried, she had a lot of hope that everything would go well.

"When they tell you they may only live for a week or a month, and they've gotten this far, they are really fighters," Aida Sandoval said. "I think that's what keeps me going -- because they want to."